Given an array and a set, return a sorted array with its items in ascending order but prioritize the elements in the set over the other items in the array.
prioritySort([5, 4, 3, 2, 1], new Set([2, 3])) ➞ [2, 3, 1, 4, 5]
prioritySort([5, 4, 3, 2, 1], new Set([3, 6])) ➞ [3, 1, 2, 4, 5]
prioritySort([-5, -4, -3, -2, -1, 0], new Set([-4, -3])) ➞ [-4, -3, -5, -2, -1, 0]